US10995777B2 - Eccentric member support that includes a piston with an expanding ring to increase friction against a cylinder wall - Google Patents
Eccentric member support that includes a piston with an expanding ring to increase friction against a cylinder wall Download PDFInfo
- Publication number
- US10995777B2 US10995777B2 US16/442,602 US201916442602A US10995777B2 US 10995777 B2 US10995777 B2 US 10995777B2 US 201916442602 A US201916442602 A US 201916442602A US 10995777 B2 US10995777 B2 US 10995777B2
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- US
- United States
- Prior art keywords
- piston
- expanding ring
- supporting
- face
- truncated cone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/06—Adjustable connecting-rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/22—Internal combustion engines
Definitions
- the invention relates to a supporting arrangement for an eccentric member of an adjusting arrangement of a connecting rod of a reciprocating piston internal combustion engine having at least one piston rod that is guided displaceably by a piston and a seal that is connected to the piston in a supporting cylinder that is provided in the connecting rod and has a longitudinal axis.
- the piston encloses at least one cylinder chamber with the supporting cylinder.
- the invention also relates to an adjusting arrangement having a supporting arrangement of this type.
- Adjusting arrangements for a connecting rod are well known in the prior art under the name VCR connecting rod.
- a variable compression can be realized in the internal combustion engine in a particularly simple way by an adjusting arrangement of this type.
- the eccentric member enables the connecting rod length and therefore the stroke of the piston in the cylinder of the internal combustion engine to be changed in a particularly simple way.
- a supporting arrangement and adjusting arrangement of the generic type are disclosed in DE 10 2005 055 199 A1.
- the known supporting arrangement has the disadvantage that an oscillating movement of the adjusting unit can occur due to the increasing gas and mass forces at relatively high engine rotational speeds. These forces lead to a slight compression of the oil, which is incompressible in theory.
- the rising pressure in the filled cylinder chamber can lead to a “blow-by” phenomena on the seal of the piston, and can contribute to a further increase in the oscillation amplitudes.
- the piston is configured in multiple pieces. More particularly, a piston lower part is arranged on a piston upper part and can be moved in the direction of the longitudinal axis of the supporting cylinder.
- An expanding ring is provided between the piston lower part and the piston upper part. The expanding ring interacts with face parts of the piston lower part and the piston upper part in such a way that spreading of the expanding ring takes place in the case of a reduction of the spacing of the face part of the piston lower part in relation to the face part of the piston upper part.
- a friction force can be applied by the expanding ring on an inner wall region of the supporting cylinder. If a defined pressure is exceeded, the piston lower part pushes the expanding ring in the direction of the piston upper part.
- the expanding ring is spread open and exerts a friction force on the inner wall region of the supporting cylinder.
- the additional friction force that is produced in this way opens a parallel force path to the supporting force by way of the oil column, and therefore reduces the tendency of the supporting arrangement to oscillate.
- the additional force path is triggered only after a defined internal pressure is reached in the cylinder chamber.
- the piston upper part may be cylindrical.
- the side of the piston upper part that is directed toward the piston lower part may have a truncated cone which tapers toward the piston lower part and is adjoined by a cylindrical attachment piece, the piston lower part being configured substantially as a cylinder, on which the seal member is arranged and which encloses the cylindrical attachment piece, the expanding ring interacting with a shell face of the truncated cone of the piston upper part and an end face of the piston lower part.
- a securing member may mount the piston lower part captively on the cylindrical attachment piece of the piston upper part.
- the expanding ring may have a funnel-shaped inner face that is directed toward the shell face of the truncated cone, and thereby assures a very accurate homogeneous spreading of the expanding ring.
- the invention also relates to an adjusting arrangement having a supporting arrangement of the type described above.
- the supporting arrangement may have two supporting cylinders with in each case one piston rod and one piston.
- FIG. 1 is a cut-away view of a connecting rod for a reciprocating piston internal combustion engine with an adjusting arrangement according to the invention.
- FIG. 2 is a front view of the connecting rod of FIG. 1 in different “stroke positions”.
- FIG. 3 is a sectional view of the piston of a supporting arrangement.
- FIG. 4 is a diagrammatic view of the piston of FIG. 3 in a supporting cylinder of the supporting arrangement at a pressure p 1 .
- FIG. 5 is a diagrammatic view of the piston of FIG. 3 in the supporting cylinder of the supporting arrangement at a pressure p 2 .
- FIG. 1 shows a VCR connecting rod 2 in a cut-away view.
- the VCR connecting rod 2 is used in a reciprocating piston internal combustion engine (not shown in further detail).
- the connecting rod 2 has a connecting rod eye 4 that is connected to a reciprocating piston of the reciprocating piston internal combustion engine.
- An adjusting arrangement 6 is provided to enable a stroke change to be performed.
- the adjusting arrangement 6 enables an eccentric member 8 that is arranged in the connecting rod eye 4 to transfer the connecting rod 2 (as shown in FIG. 2 ) substantially from a “low” position (the left-hand connecting rod in FIG. 2 ) into a “high” position (the right hand connecting rod in FIG. 2 ).
- a supporting arrangement 10 is provided to transfer the eccentric member 8 in a targeted manner and to fix the eccentric member 8 in a desired position.
- the supporting arrangement 10 has two supporting cylinders 12 , 14 each of which has a longitudinal axis 16 .
- one piston rod 18 with one piston 20 is guided displaceably in the supporting cylinders 12 , 14 .
- the piston 20 encloses a cylinder chamber 22 with the respective supporting cylinder 12 , 14 .
- the cylinder chamber 22 is filled with oil and supports the respective piston 20 , and therefore also supports the eccentric member 8 in the selected position.
- the respective piston 20 has a seal member 24 to seal the cylinder chamber.
- the respective supporting cylinder 12 , 14 has valves 26 to allow the oil to flow into or from the respective cylinder chamber 22 in the case of the transfer movement of the eccentric member 8 .
- FIG. 3 is a diagrammatic view of the piston 20 of FIG. 1 in a diagrammatic sectional view and is referred to herein to describe the supporting arrangement 10 of the invention in greater detail.
- the piston 20 is configured in multiple pieces and comprises a piston upper part 28 and a piston lower part 30 .
- the piston rod 18 is articulated in the piston upper part 28 .
- the piston upper part 28 is cylindrical in the region 32 that faces away from the piston lower part 30 .
- the cylindrical region 32 is adjoined by a truncated cone 34 that tapers toward the piston lower part 30 and is in turn adjoined by a cylindrical attachment piece 36 .
- the piston lower part 30 is substantially as a cylinder, on which the seal member 24 is arranged, and encloses the cylindrical attachment piece 36 .
- the piston lower part 30 is arranged on the piston upper part 28 to move in the direction of the longitudinal axis 16 .
- a securing member 38 is provided and functions as a captive securing means to prevent the piston lower part 30 from sliding off the piston upper part 28 in the completely unloaded state.
- An expanding ring 40 is provided between the piston upper part 28 and the piston lower part 30 .
- the expanding ring 40 interacts with face parts 42 , 44 of the piston upper part 28 and the piston lower part 30 in such a way that the expanding ring 40 spreads in response to a reduction of the spacing of the face part 44 of the piston lower part 30 in relation to the face part 42 of the piston upper part 28 , and a friction force FR can be applied by the expanding ring 40 on an inner wall region 46 of the supporting cylinder 12 , 14 (in this regard, see FIGS. 4 and 5 ).
- the face part 42 of the piston upper part 28 is configured as a shell face 42 of the truncated cone, and the face part 44 is configured as an end face of the piston lower part 30 .
- the expanding ring 40 has a funnel-shaped inner face 48 on its side that is directed toward the shell face 42 to ensure a particularly homogeneous and defined spreading out.
- FIGS. 4 and 5 now diagrammatically show the supporting cylinder 12 , a cylinder chamber 22 that is filled with oil being enclosed by way of the multiple-piece piston 20 .
- the valve 26 from FIG. 1 is not shown here.
- a pressure p 1 prevails in the cylinder chamber 22 and is lower than a preset critical pressure pkrit.
- the pressure p has risen to the pressure p 2 , which is now greater than the critical pressure pkrit.
- the invention is not restricted to the illustrated embodiment.
- the cylinder chamber 22 does not necessarily have to be arranged below the piston lower part 30 and can be arranged above the piston upper part 28 .
- the adjusting arrangement 6 also is not restricted to the embodiment having two supporting cylinders 12 , 14 . It is also possible that a supporting arrangement 10 with only one supporting cylinder and a plurality of cylinder chambers is provided.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018114349.4A DE102018114349B3 (en) | 2018-06-15 | 2018-06-15 | Supporting arrangement for an eccentric member of an adjustment arrangement and adjusting arrangement |
DE102018114349.4 | 2018-06-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20190383311A1 US20190383311A1 (en) | 2019-12-19 |
US10995777B2 true US10995777B2 (en) | 2021-05-04 |
Family
ID=68105142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/442,602 Active 2039-08-26 US10995777B2 (en) | 2018-06-15 | 2019-06-17 | Eccentric member support that includes a piston with an expanding ring to increase friction against a cylinder wall |
Country Status (2)
Country | Link |
---|---|
US (1) | US10995777B2 (en) |
DE (1) | DE102018114349B3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018115727B3 (en) * | 2018-06-29 | 2019-11-07 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Supporting arrangement for an eccentric member of an adjustment arrangement and adjusting arrangement |
DE102020112990B3 (en) | 2020-05-13 | 2021-09-16 | Hochschule Heilbronn | VCR connecting rods with locking system |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5490445A (en) * | 1994-03-14 | 1996-02-13 | Ford Motor Company | Ultra low device volume piston system |
US20020119055A1 (en) * | 2001-02-12 | 2002-08-29 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulic operating systems for clutches and the like |
DE102005055199A1 (en) | 2005-11-19 | 2007-05-24 | Fev Motorentechnik Gmbh | Reciprocating internal combustion engine e.g. commercial vehicle diesel engine, has eccentric tappet moved along length of piston rod, where changeable resistor affects adjustment movement of tappet and effects adjustment movement of tappet |
US20100303645A1 (en) * | 2009-05-27 | 2010-12-02 | Hitachi Industrial Equipment Systems Co., Ltd. | Reciprocative Compressor |
DE102015109024A1 (en) | 2015-06-08 | 2016-12-08 | Weber Schraubautomaten Gmbh | magazine |
DE102015213278A1 (en) | 2015-07-15 | 2017-01-19 | Schaeffler Technologies AG & Co. KG | Device for changing the compression ratio of a cylinder unit of a reciprocating internal combustion engine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015109924A1 (en) | 2015-03-10 | 2016-09-15 | Hilite Germany Gmbh | Piston for a connecting rod and connecting rod |
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2018
- 2018-06-15 DE DE102018114349.4A patent/DE102018114349B3/en active Active
-
2019
- 2019-06-17 US US16/442,602 patent/US10995777B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5490445A (en) * | 1994-03-14 | 1996-02-13 | Ford Motor Company | Ultra low device volume piston system |
US20020119055A1 (en) * | 2001-02-12 | 2002-08-29 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulic operating systems for clutches and the like |
DE102005055199A1 (en) | 2005-11-19 | 2007-05-24 | Fev Motorentechnik Gmbh | Reciprocating internal combustion engine e.g. commercial vehicle diesel engine, has eccentric tappet moved along length of piston rod, where changeable resistor affects adjustment movement of tappet and effects adjustment movement of tappet |
US20100303645A1 (en) * | 2009-05-27 | 2010-12-02 | Hitachi Industrial Equipment Systems Co., Ltd. | Reciprocative Compressor |
DE102015109024A1 (en) | 2015-06-08 | 2016-12-08 | Weber Schraubautomaten Gmbh | magazine |
DE102015213278A1 (en) | 2015-07-15 | 2017-01-19 | Schaeffler Technologies AG & Co. KG | Device for changing the compression ratio of a cylinder unit of a reciprocating internal combustion engine |
Non-Patent Citations (1)
Title |
---|
German Search Report dated Mar. 26, 2019. |
Also Published As
Publication number | Publication date |
---|---|
US20190383311A1 (en) | 2019-12-19 |
DE102018114349B3 (en) | 2019-10-24 |
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